/*
 * Copyright (c) 2007 innoSysTec (R) GmbH, Germany. All rights reserved.
 * Original author: Edmund Wagner
 * Creation date: 04.06.2007
 *
 * Source: $HeadURL$
 * Last changed: $LastChangedDate$
 * 
 * 
 * the unrar licence applies to all junrar source and binary distributions 
 * you are not allowed to use this source to re-create the RAR compression algorithm
 *
 * Here some html entities which can be used for escaping javadoc tags:
 * "&":  "&#038;" or "&amp;"
 * "<":  "&#060;" or "&lt;"
 * ">":  "&#062;" or "&gt;"
 * "@":  "&#064;" 
 */
package com.github.junrar.unsigned;

import com.github.junrar.crc.RarCRC;

/**
 * DOCUMENT ME
 * 
 * @author $LastChangedBy$
 * @version $LastChangedRevision$
 */
public class UnsignedByte
 {

  public static byte longToByte(long unsignedByte1)
   {
    return (byte) (unsignedByte1 & 0xff);
   }

  public static byte intToByte(int unsignedByte1)
   {
    return (byte) (unsignedByte1 & 0xff);
   }

  public static byte shortToByte(short unsignedByte1)
   {
    return (byte) (unsignedByte1 & 0xff);
   }

  public static short add(byte unsignedByte1, byte unsignedByte2)
   {
    return (short) (unsignedByte1 + unsignedByte2);
   }

  public static short sub(byte unsignedByte1, byte unsignedByte2)
   {

    return (short) (unsignedByte1 - unsignedByte2);
   }

  public static void main(String[] args)
   {
    // tests unsigned (signed)
    // add
    System.out.println(add((byte) 0xfe, (byte) 0x01)); // 255 (-1)
    System.out.println(add((byte) 0xff, (byte) 0x01)); // 0 (0)
    System.out.println(add((byte) 0x7f, (byte) 0x01)); // 128 (-128)
    System.out.println(add((byte) 0xff, (byte) 0xff)); // 254 (-2)

    // sub
    System.out.println(sub((byte) 0xfe, (byte) 0x01)); // 253 (-3)
    System.out.println(sub((byte) 0x00, (byte) 0x01)); // 255 (-1)
    System.out.println(sub((byte) 0x80, (byte) 0x01)); // 127 (127)
    // mul
    System.out.println((byte) -1 * (byte) -1);
   }
 }
